package com.hzgood.springcloud.controller;

import com.hzgood.springcloud.entities.CommonResult;
import com.hzgood.springcloud.entities.Payment;
import com.hzgood.springcloud.lb.LoadBalance;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {
    //public static final String PAYMENT_URL = "http://127.0.0.1:8001";
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE"; //需要开启restTemplate负载均衡功能
    @Resource
    private RestTemplate restTemplate;

    @Resource
    private LoadBalance loadBalance;

    @Resource
    private DiscoveryClient discoveryClient;

    @PostMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment) {
        return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }

    @GetMapping("/consumer/payment/getForObject/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id) {
        return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id) {
        // 获取更详细的信息用 getForEntity
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        if (entity.getStatusCode().is2xxSuccessful()) {
            return entity.getBody();
        } else {
            return new CommonResult<>(404, "操作失败");
        }
    }

    /**
     * 自定义LB 轮询算法调用
     * @return
     */
    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB() {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances == null || instances.size() <= 0) {
            return null;
        }

        ServiceInstance serviceInstance = loadBalance.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri + "/payment/lb", String.class);
    }
}
